On Tue, Apr 7, 2020 at 11:44 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote: > > The 'AS' variable is unused for building the kernel. Only the remaining > usage is to turn on the integrated assembler. A boolean flag is a better > fit for this purpose. > > AS=clang was added for experts. So, I replaced it with LLVM_IA=1, > breaking the backward compatibility. > > Suggested-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx> Thank you for this series! Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> > --- > > Changes in v2: > - new patch > > Documentation/kbuild/llvm.rst | 5 ++++- > Makefile | 2 +- > 2 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/Documentation/kbuild/llvm.rst b/Documentation/kbuild/llvm.rst > index eefbdfa3e4d9..2b40afa58049 100644 > --- a/Documentation/kbuild/llvm.rst > +++ b/Documentation/kbuild/llvm.rst > @@ -50,11 +50,14 @@ LLVM Utilities > LLVM has substitutes for GNU binutils utilities. These can be invoked as > additional parameters to `make`. > > - make CC=clang AS=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ > + make CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \\ > OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump OBJSIZE=llvm-size \\ > READELF=llvm-readelf HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar \\ > HOSTLD=ld.lld > > +Currently, the integrated assembler is disabled by default. You can pass > +LLVM_IA=1 to enable it. > + > Getting Help > ------------ > > diff --git a/Makefile b/Makefile > index 1b2691057cb5..f9beb696d6d3 100644 > --- a/Makefile > +++ b/Makefile > @@ -538,7 +538,7 @@ endif > ifneq ($(GCC_TOOLCHAIN),) > CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) > endif > -ifeq ($(if $(AS),$(shell $(AS) --version 2>&1 | head -n 1 | grep clang)),) > +ifneq ($(LLVM_IA),1) > CLANG_FLAGS += -no-integrated-as > endif > CLANG_FLAGS += -Werror=unknown-warning-option > -- > 2.17.1 > > -- > You received this message because you are subscribed to the Google Groups "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200407184336.14612-1-masahiroy%40kernel.org. -- Thanks, ~Nick Desaulniers
